12 core Ryzen 3900x with all cores at 4.1GHz and RTX 3080ti with 1695MHz base clock.
Test set of 20 20Mp images. Export to disk times for the set:
No corrections applied: 10s
Basic corrections and DeepPrime: 66s
Basic corrections and DeepPrime with GPU forced to 765MHz: 70s.
Halving the GPU clock to add 4 seconds of processing time indicates only 4 of the 66s was GPU processing time or at least time waiting for the GPU.
As long as it is 2 or more the ‘Performance | simultaneously processed images’ setting makes almost no difference. For each simultaneously processed image an instance of DxO.PhotoLab.ProcessingCore.exe is run. Only one instance at a time takes significant processor cycles (presumably the one that ‘owns’ the GPU) and that instance uses at most about 15% CPU (2 cores worth). During export overall CPU usage doesn’t get much above 20%.
Reducing the CPU clock increased processing times almost exactly in proportion.
Don’t know if PL5 can be better optimized and/or use more CPU cores, if not it is looking like high end RTX GPUs do not offer much extra performance for the money.
At about 1/3rd the price does an RTX 3060ti with half the cores of a 3080ti perform the same as a 3080ti at half clock speed?